If you weren't married, then he has no legal obligations that a divorce would resolve. He may have other obligations as an employer and/or landlord, but that is regardless of whether you were in a relationship with him or not.
If you worked for him and he provided you room and board and utilities and other benefits (car, phone, bills), that can be considered compensation.
You pretty much don't have any rights. I'm guessing that you don't have a lease to occupy the condo. And Pennsylvania is an employment at-will state, which means that if living in the condo was part of your compensation for working for him, either of you can end the employment at any time for pretty much any reason (or no reason at all) and he doesn't have to compensate you anymore.
While I'm sorry to hear that you are going through this difficulty, be thankful that at least you don't have to litigate anything. You can walk away, make a clean break and start over immediately.
Crash with family or friends until you find a new job, and never mix business with pleasure (don't date anyone you work with, don't work with anyone you're dating).